Dialects evolve, sure. Although it's worth noting that if one had adopted Common Lisp in the '90s one would have a stable base that is today, 20 years later, st

Dialects evolve, sure. Although it's worth noting that if one had adopted Common Lisp in the '90s one would have a stable base that is today, 20 years later, still ahead of basically everything on the language level (except for the type system as noted in other comments).